#include<stdio.h>
#define N 10
int main(void){
    int i;
    float a[N],s=0;

    printf("please input %d students'score:\n",N);
    for(i=0;i<N;i++){
        scanf("%f",&a[i]);
        getchar();
    }
    for(i=0;i<N;i++){
        s += a[i];
    }
    printf("the average is:%.2f\n",s/N);
    getchar();
    return 0;
}